1.Ó¢¹ú¡¶Ð¿Æѧ¼Ò(New Scientist)¡·ÔÓÖ¾ÆÀÑ¡³öÁËÄê¶ÈÊÀ½ç8Ïî¿Æѧ֮×ÔÚXTEJ1650£­500Ë«ÐÇϵͳÖз¢ÏÖµÄ×îСºÚ¶´Î»ÁÐÆäÖУ®ÈôijºÚ¶´µÄ°ë¾¶RԼΪ45 km£¬ÖÊÁ¿MºÍ°ë¾¶RµÄ¹ØϵÂú×ã  (ÆäÖÐcΪ¹âËÙ£¬GΪÒýÁ¦³£Á¿)£¬Ôò¸ÃºÚ¶´±íÃæÖØÁ¦¼ÓËٶȵÄÊýÁ¿¼¶Îª(   )

A£®10⁸ m/s^{2                                                             £®1010 m/s2}B

C£®10¹² m/s^{2                                                           £®1014 m/s2}D

2.ÌìÎÄѧ¼Òз¢ÏÖÁËÌ«ÑôϵÍâµÄÒ»¿ÅÐÐÐÇ£®Õâ¿ÅÐÐÐǵÄÌå»ýÊǵØÇòµÄ4.7±¶£¬ÖÊÁ¿ÊǵØÇòµÄ25±¶£®ÒÑ֪ijһ½üµØÎÀÐÇÈƵØÇòÔ˶¯µÄÖÜÆÚԼΪ1.4Сʱ£¬ÒýÁ¦³£Á¿G£½6.67×10^£­11 N·m²/kg²£¬Óɴ˹ÀËã¸ÃÐÐÐǵÄƽ¾ùÃܶÈԼΪ(   )

A£®1.8×10³ kg/m^{3                                          £®5.6×103 kg/m3}B

C£®1.1×10⁴ kg/m³                          D£®3.0×10⁴ kg/m³